Aeroflow inline radiator hose fillers are designed to be used in a radiator hose to provide a remote coolant system fill. Machined from 6061-T6 billet aluminium it accepts a large 42mm radiator cap. Machined with 2 x 1/8” NPT ports for water temp or pressure gauges with one port featuring a straight 5/16” (8mm) barb fitting included. This filler features 1.5" barbed fittings to suit 1.5" rubber hose.